Alexander 'Álex' Vallejo Mínguez (born 16 January 1992) is a Spanish professional footballer who plays as a midfielder for Hungarian club Diósgyőr.

Born in Vitoria-Gasteiz, Álava, Vallejo finished his graduation with Deportivo Alavés' youth setup, and made his senior debut with the club's reserves in the 2011–12 season, in the Tercera División.

On 20 August 2011, he made his first-team debut, but was substituted after 24 minutes after conceding a penalty in a 2–2 away draw against CA Osasuna B, in the Segunda División B championship.

[5] On 20 December 2014, Vallejo scored his first professional goal in a 3–1 away loss to SD Ponferradina; this match proved to be his last one with the main squad before suffering a severe knee injury in April 2015, sidelining him for nearly two years.

[6] On 2 July 2017, after suffering relegation from the Segunda División, free agent Vallejo signed a two-year contract with fellow second-tier team Córdoba CF.